Final Report - ICPDR

Total mercury concentration was between >0.03 – 0.13 µg/l in the Tisza river. The
highest value was measured downstream of the confluence of the Maros tributary,
which discharged very high (0.25 µg/l) mercury concentration owing to the extreme
large suspended solids content during flood period. The dissolved mercury
concentrations were below the 0.1 µg/l limit value.
The cadmium, lead, chromium, copper, nickel, zinc, aluminum, iron, manganese and
arsenic total concentrations showed a similar longitudinal profile along the Tisza river
as it was experienced for the mercury: moderately low values in the upper and
middle section of the river and significant increase downstream of the Maros
confluence. Only a minor part of the total metal content was in dissolved form. The
dominant proportion of the metals was attached to suspended particles. The Figures
4.1.2.2-12 illustrate the heavy metal content of original and filtered water samples in
pairwise comparison.
0,3
0,25
Tisza
Tributaries
Concentration of Hg (µg/l)
0,2
0,15
0,1
0,05
0
0 100 200 300 400 500 600 700 800
Distance (km)
Figure 4.1.2.2 Amount of Hg in the original water sample
4,00
3,50
Concentration of Cd (ug/l)
3,00
2,50
2,00
1,50
1,00
Tisza
Tributary
0,50
0,00
0 100 200 300 400 500 600 700 800
Distance (km)
Figure 4.1.2.3 Amount of Cd in the original water sample
19